Stop-motion mechanism



Oct. 30, 1928.

G. F. MATTESON STOP MOTION MECHANISM Filed May 2, 1925 Patented Qa. 30,1928.

1,689,287 PATENT OFFICE.-

GEOBGE IBANKLYN KATTESON, OI ROCKY HILL, CONNECTICUT, ASBIGNOB TO THEI'ULLEB BRUSH COMPANY, O! HARTFORD, CONNECTICUT, A. COBTOBATION Ol' CON-mic'noor,

STOP-MOTION MECHANISM.

Application filed Kay 9, Serial No. 27,577.

My invention relates to the class of devices that are em loyed forstoppin the operation of a mac line when abnorma conditions arise, andan object of my invention,

among others, is to rovide a mechanism of this kind that shall e simplein construction and particularl efiicient in operation.

One form of mec anism embodyin my invention and in the construction anuse 1 of which the objects herein set out, as well as others, may beattained, is illustrated in the accompanying drawings, in which- Figure1 is a view in side elevation of a mechanism embodying my invention,parts of the machine to which the mechanism-is applied being broken awayto show construction.

Figure 2 is a view similar to Fi re 1, but looking in a direction from apolnt' located at right angles to the point of view of Figure 1.

Figure 3 is a detail view, scale enlarged, in

section through a portion of the device on a lane denoted by the dottedline 3-3 of i ure 1 y invention is particularly applicable to machinesembodying reciprocatin members in which definite and accurate egrees ofmovement are required and in which certainty of operation of the stopmotion mechanism is essential when a predetermined resistance to themovement of such parts takes place, such conditions being present in amachine in which pieces of metal are moved 5 from one osition to anotherafter the operation of dies thereon. Such a machine has, therefore, beenselected by me for the purpose of illustration in the drawing herein ofmechanism embodying my invention, in which drawings the numeral 5indicates a portion of the frame of a punch press embodying a table 6with a bed plate 7 thereon supportlng dies 8-9 in connection with whichdies 10-11 operate for the purpose of forming pieces of metal. A feeddevice 12 of any ordinary form of construction is employed for feeding astrip 13 of metal to the dies, in which dies such piece of metal isformed, this mechanism embodying a plunger 14 for moving a formed .orpartially formed piece of metal from one set of dies to the other, theplunger 14 having a reciprocating. movement caused by1 the feed device12.

In moving t ese pieces of metal it is important that they be accuratelypositioned, and 1t is essential that if any material resistance tothemovement of the pieces is had the operatlon of the machine shall bestopped, as undue resistance will cause an operating lever 15 to bebroken and in manycases inury to or breaking of the plunger 14 orthe des hereinabove referred to, with a consequent loss of time in replacingthe broken or 1n ured parts.

The lever 15 is pivoted at its lower end to a bracket 16 and is operatedas by means of a connecting rod 17 enga ed with a cam 18 secured to ashaft 19, which shaft may also operate other members of the mechanismand WhlOh is connected with other operative arts of the machineincluding the plunger ead 20 to WhlCh the dies 10 and 11 are secured.The shaft 19 is driven as by means of intermeshing bevel gears and aconnecting shaft 21, shown in dotted outlines in Fi ure 1 of thedrawings, this shaft 21 being riverfes by means of a belt passing arounda pulley 22. A clutch of any ordinary form and construction is employedfor connecting the pulley 22 with the shaft 21, this clutch embodymg aclutch member 23, and it is in connection with this clutch member thatin improved stop motion mechanism is emp oyed. This stop motionmechanism comprises a clutch actuating lever 24 operatively connectedwith the clutch member 23 in any ordinary manner and supported by a rockshaft 25 to which a handle lever 26 for manual operation of the clutchis secured. A sto motion lever 27 is secured to the shaft 25 an isconnected by a link 28 with a stop motion arm 29. The link 28 isconnected with the lever 27 by means of a pin and slot connection thatis such as to permit a movement of the link 28 in the ordinar thzemachine and independent y of the lever 2 4 The stop motion arm 29 ispivoted as at 30 to the operating lever 15, and this arm is rigidlysecured to the connecting rod 17 by means of a stud 31 threaded into thearm 29 and pivotally engaged within an opening in one of the ears of theforked end of the rod 17, and as shown in Figure 3 of the drawings, saidarm being, by means of these parts, rigidl connected with the lever 15.

' he connecting rod 17 is breakably connected to the operating lever 15by means of at operation of shearable pin 32 extending through a bushing33 in one of the ears of the for ed end of the lever 17, throu h abushing 34 in the lever 15 and through a ole in the stud 31. Thisshearable pin 32 is composed of comparative ly soft metal, such that itmay be sheared off upon application of an abnormal degree of forceresisting movement of the feed device 12, and the bushings 33-34 areformed of comparatively hard metal so that shearing off of the pin mayreadily take place.

It will thus be seen that in the operation of the machine under normalconditions the lever 15 will be moved to and fro and the link 28 will,in this operation, move freely and independently of the stop motionlever 27, but should undue obstruction to movement of the lever 15 occurthe pin 32 will be severed thereby permitting the connecting rod 17 tobe moved by the cam 18 independently of the lever 15 as, when the pin 32becomes severed, the rigid connection hereinbefore described of the arm29 with the lever 15 is broken, and thereafter there exists only thepivotal connection of the pivot between said arm and lever. At the sametime the 7 connection existing between said arm and the connecting rod17 comprising the stud 31 1 causes the arm 29, which has previously beenmoved contemporaneously with the lever 15, to be swung on its pivot andthereby move independently of said lever, the extent of movementimparted to the lowenend of the arm now exceeding that before existing,and being such as to cause en agement of the ends of the slot 35 in thelin 28 with the pin in said slot, whereby the stop motion lever 27 isoperated to rock the shaft 25 and cause operation of the clutchmechanism to separate the clutch parts and stop operation of themachine.

In accordance with the provisions of the patent statutes I havedescribed the principles of operation of m invention, together with thedevice which I now consider to represent the best embodiment thereof;but I desire to have it understood that the device shown is onlyillustrative, and that the invention may be carried out by other meansand applied to uses other than those above set out.

I claim 1. A stop motion mechanism including a member movable to stopoperation of the machine, an operating device, and a connection betweensaid movable member and said op- V erating device, said connectionincluding a member 0 erable independently of said movable mem er undernormal conditions, and a member adapted to move under abnormalconditions to increase the movement of said operable member and therebycause a stoppmg movement of said/ independently operable member.

2. A stop motion mechanism including a member movable -to stop operationof the machine, an operating device,'and a connection between saidmovable member and said operating device, said connection including anoperating member, a stop member movably connected to said operatingmember, and meansfor securin said operating member and said stop memfimrtogether for simultaneous movement under normal conditions but forindependent movement under abnormal conditions, said 0 erable memberceasing its movement when tlie other member acts.

3. A stop motion mechanism including a member movable to stop operationof a ma chine, an operating devlce, and a connection between saidmovable member and said op erating device, said connection including anoperatmg member, a stop member movably connecte with said operatingmember, and means for securing said operating member and said stopmember together for simultaneous movement, said means being adapted tobe ruptured on the application of abnormal forces in the operation ofthe mechanism, said operable member ceasing its movement when the othermember acts.

4. A stop motion mechanism including a member movable to stop operationof a machine, an operating device, and a connection between said movablemember and said operating device, said connection including an operatingmember, a stop member pivotally mounted on said operating member, andmeans for securing said stop member to saidoperatingmemberforsimultaneousmovement thereof, said means being adaptedto be ruptured on the application of abnormal forces thereto to therebpermit pivotal movement pJf the stop member on the operating mem- 5. Astop motion mechanism including a member movable to stop operation of amachine, an opera-tin device, and a connection between said mova lemember and said oper- Hll ating device, said connection including anoperating member, a stop member movably connected to said operatingmember, and means for securin said operating member and said stop mem ertogether for simultaneous movement under normal conditions but forpermitting independent movement under abnormal conditions, and aconnecting member movable independently of said movable member and alsosimultaneous therewith for stopping operation of the machine.

6. A stop motion mechanism including a member movable to stop operationof a machine, an operating device, and a connection between said movablemember and said operating device, said connection including a memberoperable independently of said movable member under normal conditions ofoperation of the machine, and means for imparting excessive movement tosaid independently operable member to effect movement of said movablemember.

7 A stop motion mechanism including a member movable to stop operatlonof a machine, an operatin device and a connection between said mova le'member and said oper-' atin device, said connection including a mem rhaving a. lost motion and thereby operable independently of said movablemember under normal conditions of operation of the machine, and meansfor causing said member to move in excess of said lost motion andthereby effect operation of said movable under normal conditions, meansfor severing said connection under abnormal conditions, and a connectingmember operated by said stop member and havin a normalmovement-independently of said movable member and an excessive movementcaused by the severing of said connectionwvhereby operation of saidmovable member to stop operation of the machine is effected;

9.'A stop motion mechanism including a member movable to stop operationof a machine, an operating device, anda connection between said movablemember and said op erating device, said connection including anoperating lever, a stop member mounted on said lever to moveindependently thereof, means for securing the stop leverto said memberfor simultaneous movement therewith under normal conditionsibut to ermitsaid independent movement under a normal condi-' tions, and a linkconnected with said stop member and having a movement independent- 1 ofsaid movable member under normal conditions of operation and anexcessive movement caused b the independent movement of said stop memberwhereby said movable member is operated to stop the machine.

10. A stop motion mechanism including a member movable to stop operationof the machine, an operating device, and a connection between saidmovable member and said operating device and including a member having adefinite range of movement under normal conditions and a member tochange said range of movement under abnormal conditions and therebycause operation of said movable member to stop the machine.

11. A stop motion mechanism including a member mdvable to stop operationof the machine, an operatin device, and a connection between said movale member and said operating device and including a member havingditions and a member adapted to be ruptured upon undue resistance tomovement of said operating device and thereby increase said .range ofmovement to efi'ect movement of said vsaid operated member andopgrableindependently of said'stopping mem r under abnormal conditionsand a member adapted to be ruptured under abnormal conditions to eifectmovement of said means independently of said operated member to operatesaid stopping member to stopthe machine.

, GEORGE FRANKLYN MATTESON.

' a certain range movement under normal con-

